Gitlab部署标签yaml错误traefik-metadata.labels:无效值

我正在尝试部署我的应用程序，但我正在添加的traefik标签出现以下yaml错误，以便traefik检测应用程序

$ kubectl apply -f example-app.yml
The ReplicationController "example-app" is invalid: 
* metadata.labels: Invalid value: "Host(`mydomain.com`)": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

我的示例-app.yml：

apiVersion: v1
kind: ReplicationController
metadata:
  namespace: example
  name: example-app
  labels:
    example-component: "example-app"
    traefik.enable: "true"
    traefik.http.routers.example-app.rule: "Host(`mydomain.com`)"
    traefik.http.routers.example-app.entrypoints: "web"

我还尝试：

  - "example-component=example-app"
  - "traefik.http.routers.example-app.rule=Host(mydomain.com)"
  - "traefik.http.routers.example-app.entrypoints=web"
  - "traefik.enable=true"

但是你可以得到：

invalid type for io.k8s.apimachinery.pkg.apis.meta.v1.ObjectMeta.labels: got "array", expected "map"];